the.com/steel
the only thing tougher than iron is iron that learned discipline
mostly ironSteel is iron with a pinch of carbon, under 2%
infinitely rebornMost recycled material on Earth, melted endlessly
Damascus secretAncient blades held carbon nanotubes, only found recently
self-healingNew alloys regrow cracks at room temperature
skyscraper spineSkyscrapers exist because steel beats stone's weight